linux-kernel - Re: drivers/remoteproc/mtk_scp.c:645:34: warning: unused variable 'mtk_scp_of

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Message-ID: <CAPBb6MXTUJ31jpif5ucZs6rPDhuCZrqUOjVpzZAHqy-Hg71ByA@mail.gmail.com>
Date:   Mon, 2 Nov 2020 16:41:36 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        LKML <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: drivers/remoteproc/mtk_scp.c:645:34: warning: unused variable 'mtk_scp_of_match'

On Mon, Nov 2, 2020 at 9:09 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Alexandre,
>
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   3cea11cd5e3b00d91caf0b4730194039b45c5891
> commit: cbd2dca74926c0e4610c40923cc786b732c9e8ef remoteproc: scp: add COMPILE_TEST dependency
> date:   5 weeks ago
> config: x86_64-randconfig-a005-20201102 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 235dfcf70abca65dba5d80f1a42d1485bab8980c)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install x86_64 cross compiling tool for clang build
>         # apt-get install binutils-x86-64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cbd2dca74926c0e4610c40923cc786b732c9e8ef
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout cbd2dca74926c0e4610c40923cc786b732c9e8ef
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/remoteproc/mtk_scp.c:645:34: warning: unused variable 'mtk_scp_of_match' [-Wunused-const-variable]
>    static const struct of_device_id mtk_scp_of_match[] = {
>                                     ^
>    1 warning generated.
>
> vim +/mtk_scp_of_match +645 drivers/remoteproc/mtk_scp.c

This happens when COMPILE_TEST is set but not OF_CONFIG. Sent a fix
for this: https://lkml.org/lkml/2020/11/2/102